Iron Mountain Incorporated
US ˙ NYSE ˙ US46284V1017

SecurityIRM / Iron Mountain Incorporated
InstitutionHancock Whitney Corp
Latest Disclosed Ownership4,202 shares
Latest Disclosed Value $ 529,362
Hancock Whitney Corp reports 5.81% decrease in ownership of IRM / Iron Mountain Incorporated

On May 15, 2026 - Hancock Whitney Corp filed a 13F-HR form disclosing ownership of 4,202 shares of Iron Mountain Incorporated (US:IRM) valued at $429,192 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 4,461 shares of Iron Mountain Incorporated. This represents a change in shares of -5.81% during the quarter. The current value of the position is $537,646 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F IRON MTN INC DEL COM 46284V101 4,202 -259 -5.81 529 42.97 0.0092
2026-02-17 2025-12-31 13F IRON MTN INC DE COM 46284V101 4,461 -68 -1.50 370 -19.74 0.0067
2025-11-17 2025-09-30 13F IRON MTN INC DEL COM 46284V101 4,529 -299 -6.19 462 -6.87 0.0084
2025-08-14 2025-06-30 13F IRON MTN INC DEL COM 46284V101 4,828 -261 -5.13 495 13.27 0.0095
2025-05-15 2025-03-31 13F IRON MTN INC DEL COM 46284V101 5,089 -6,668 -56.72 438 -64.62 0.0143
2025-02-14 2024-12-31 13F IRON MTN INC DEL COM 46284V101 11,757 53 0.45 1,236 -11.15 0.0391
2024-11-13 2024-09-30 13F IRON MTN INC DEL COM 46284V101 11,704 -2 -0.02 1,391 32.51 0.0448
2024-08-13 2024-06-30 13F IRON MTN INC DEL COMMON STOCK 46284V101 11,706 -1,093 -8.54 1,049 2.24 0.0356
2024-05-16 2024-03-31 13F IRON MTN INC DEL COMMON STOCK 46284V101 12,799 -3,577 -21.84 1,027 -10.39 0.0354
2024-02-14 2023-12-31 13F IRON MOUNTAIN COM 46284V101 16,376 -104 -0.63 1,146 16.96 0.0425
2023-11-13 2023-09-30 13F IRON MOUNTAIN COM 46284V101 16,480 65 0.40 980 4.93 0.0404
2023-11-13 2023-06-30 13F/A-1 IRON MTN INC DEL COM 46284V101 16,415 -1,349 -7.59 933 -0.64 0.0367
2023-08-10 2023-06-30 13F IRON MTN INC DEL COM 46284V101 16,415 -1,349 1 0.0367
2023-11-13 2023-03-31 13F/A-2 IRON MTN INC DEL COM 46284V101 17,764 689 4.04 939 10.34 0.0377
2023-05-16 2023-03-31 13F/A-1 IRON MTN INC DEL COM 46284V101 17,764 689 1 0.0201
2023-05-15 2023-03-31 13F IRON MTN INC DEL COM 46284V101 17,075 0 1 0.0176
2023-11-13 2022-12-31 13F/A-1 IRON MTN INC DEL COM 46284V101 17,075 -60 -0.35 851 13.01 0.0328
2023-02-03 2022-12-31 13F IRON MTN INC DEL COM 46284V101 17,075 -60 1 0.0328
2022-10-26 2022-09-30 13F IRON MTN INC DEL COM 46284V101 17,135 254 1.50 753 -8.39 0.0322
2022-08-08 2022-06-30 13F IRON MTN INC COM 46284V101 16,881 588 3.61 822 -8.87 0.0329
2022-05-12 2022-03-31 13F IRON MTN INC COM 46284V101 16,293 -162 -0.98 902 4.76 0.0307
2022-01-25 2021-12-31 13F IRON MTN INC COM 46284V101 16,455 -29 -0.18 861 20.25 0.0271
2021-11-04 2021-09-30 13F IRON MTN INC COM 46284V101 16,484 -9,143 -35.68 716 -33.95 0.0250
2021-08-09 2021-06-30 13F IRON MTN INC COM 46284V101 25,627 6,159 31.64 1,084 50.56 0.0346
2021-05-14 2021-03-31 13F IRON MTN INC COM 46284V101 19,468 -176 -0.90 720 24.14 0.0244
2021-02-09 2020-12-31 13F IRON MTN INC COM 46284V101 19,644 7,396 60.39 580 76.83 0.0194
2020-11-05 2020-09-30 13F IRON MTN INC COM 46284V101 12,248 12,248 328 0.0121
2016-11-08 2016-09-30 13F IRON MOUNTAIN COM 46284V101 0 -5,730 -100.00 0 -100.00
2016-08-09 2016-06-30 13F IRON MOUNTAIN COM 46284V101 5,730 5,730 228 0.0095
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.